Brush rigging



Dec. 25, 1923. 1,478,665

T. L. LEE

BRUSH RIGGING Filed March 9. 1922 Hrmvce 1mm Patented Dec. 25, 1923.

UNITED STATES 1,478,665 PATENT OFFICE.

@HOMAS L. LEE, OF ROCHESTER, NEW YORK. ASSIGNOR- TO NORTH EAST ELECTRIC COMPANY, OF ROCHESTER, NEW YORK, A. CORPORATION" OF NEW YORK,

BRUSH RIGGINGD Application filed March 9, 1922.

To ail whom it may concern:

lie it known that I, THGMAS L LEE, a citizen. or" the United States, residing at Rochester, in the county of Monroe and 6 State of New York, have invented certain new and useful Improvements in Brush Riggings; and I do hereby declare the foliowing to be a full, clear, and exact de scription of "the invention, such as wili enable others skilled in the art to which it appertains to make and use the same, a

This invention relates to brush-r1 gangs of the type in which the brushes slide in stationary brush-guides and are pressed is against the commutator by spring-pressed swinging arms @ne object of the invention is to produce a brush-rigging, of the type in question, in which the several parts are of simple and so inexpensive form and are adapted for easy and secure assembly. A second ob ect of the invention is to produce a brush-rigging in which the stationary members may be used interchangeably for opposite directions of operation. third object of the invention is provide means for equalizing the pressure and reducing the friction of the spring-pressed arm against the end of the brush.

To the foregoing ends the invention consists in the brush-rigging of which a specific form is hereinafter described, as it is defined in the appended claims. a

in the accompanying drawings 1g. 1 is an axial eievati'on of the end of a dynamoeleotrio machine, looking from the inside, provided with brush-rigging embodying the nresent invention. Figs. 2 and 3 are piani iews of two of the brush-guides and asso-- ciated parts, arranged for opposite d1rections oi operatiom Fig. i is a horizontal sectional View of the parts shown in Fig. 2. 5 is a side-eievation, on an enlarged scale, one of the springpressed arms; "d Fig. e is section on the iine ti"6 in 5, showing aiso a part of a brush associated with the arm.

The invention is iilustrated as embodied a machine provided with three brushefuides. Each guide is a tit-shaped sheet- :Thetal meinher formed integraily and com prising a middle-part 19 and two parallel arms ii... The inner surface of the par i is hat and provides a hearingsurface against which a brush may siide.

Serial No. 542,453

The arms 13. are perforated at theilz ends, to receive a bolt 12, which constitutes a post for supporting the brush-guide. The brushguide is attached to a stationary support in the form of a plate 13 (as shown in Figs. 2, 3 and 4} which plate is fixed, at the end of the machine, in a position normal to the axis thereof. The brush-guide is insulated from the plate or support 13 by'insulatingmaterial 14 interposed between these parts, and the bolt is tightened so as to clamp the brush-guide firmly against the insulatin material and thus secure the brush-guide in stationary position.

To prevent thearins of the brush-guide from being bent together by the tightening of the belt, a bushing 15 is placed upon the bolt betwen the arms. This bushing serves aiso as means for engaging and clamping a perforated iug l6 constituting part of a connector 17, conveniently adapted for use in. connecting the brush with the circuitconductors of the machine, in the usual manner.

To anchor the brush-guide securely against swinging movement about the bolt 12, a screw 18 is used, this screw engaging one or the other of two tapped holes 19 provided in the two arms of the brush-guide.

The brush is pressed towards the commutator by an. arm. 20, which is fixed to a. sleeve 21 arranged to turn on the bushing 15. A coiled spring 22 surrounds the sleeve, and one end of the spring engages the brushguide, while the other end, 23, may be engaged alternatively with three hooks 24: on the arm 20. The pressure against the brush may thus he adjusted. To eliminate friction from the movement of the arm 20, it has been found desirable to prevent engagement between the sleeve 21 and the coils of the spring, as far as possible, and accordingiy the sleeve is provided with a flange 25 which supports the spring-coils near one end, while the other end-coils are supported y a washer 2d at the end of the sleeve.

t common to provide an anti-friction :oiler the end. of the spring-pressed arm engages the brush. A. feature of the present invention resides in the use of two suc rollers, lying on opposite sides of the These rollers, 22, are connected by ahe isarts are fitted loosely, S

iioient citing may occur to permit such as is commonly ound where only one roller is used, engaging the middle of the brush.

In the illustrated machine three brushes are used, the brushes 29 being the main brush, and the brush 30 an auxiliary brush. The latter is mounted on a plate 31 which is angularly adjustable, as is common in such machines. To compensate for the thickness of the plate31 and bring the brushes all to the same plane, spacers 32 are interposed between the plate 13 and the guides of the brushes 29. I

The brushes are held against the middle parts of the guides by the reaction. of the pressures against their beveled ends, in the usual manner of a reaction brush-holder, but security against accidental displacement is afiorded by the provision of lugs 33 which.

are cut and bent from the sheet-material at the sides of the guides.

Figs. 2 and 3 show how, owing to the symmetrical form of the brush-guide, the same guide, post, insulation and other parts may be used whether the brush is to be inclined in one or the other direction. Only the spring, the spring-arm and the connector are dilferent as shown in these two figures.

The invention is not limited to the embodiment thereof hereinbefore described, and. illustrated in the drawings, but it may be embodied in various other forms within the sco e of the following claims.

he invention claimed is 1. Brush-rigging comprising, in combination with a base-member normal to the axis of a dynamo-electric machine: a reversible Ushaped brush-guide with a flat bearingsurtace on the inside of its middle-portion; a post connecting the ends of the arms of said brush guide and drawing the guide as a whole toward the base-member; insulating aa'raeee through said bearing-opening and free to tilt therein.

3. Brush-rigging comprising: a U-shaped sheet-metal brush-guide with perforations at the ends of its arms; a bolt passing through said perforations and adapted to secure the brush-guide to a support; a bushing surrounding the bolt and interposed between the arms of the brush-guide; a sleeve surrounding and rotatable upon the bushing; an arm projecting rigidly from the sleeve and adapted to engage a brush supported by the brush-guide; and a spring engagin the arm and coiled around the sleeve.

4. l.rushrigging comprising: a U-shaped sheet-metal brushguide with perforations at the ends of its arms; a bolt passing through said perforations and adapted to secure the brush-guide to a support; a bushing surrounding the bolt and interposed between the arms of the brush-guide; and a terminal-connector having a part surround ing the bolt and interposed between one end of said bushing and the adjacent arm of the brush-guide.

5. Brush-rigging comprising: a U-shaped brush-guide with a flat bearing-surface on the inside of its middle part, the brush-guide being formed integrally of sheet-metal and being perforated at the ends of its arms; a post connecting the ends of the arms and adapted to support the brush-guide; and a lug cut from the metal at one side of the brush-guide and bent inwardly substantially parallel with the middle part of the brushgnide, in position to retain a brush against said bearing-surface.

THOMAS L. LEE. 

